How to unlock the F2000 in Battlefield 4 - Express Train Assignment

Here is how you can earn the new F2000 assault rifle in Battlefield 4 Second Assault with the express train assignment. The F2000 is a fully modular, completely ambidextrous assault rifle. Its modules can be changed without the aid of tools making it very versatile.

Far and away my favorite gun in the game. Ever since I started using it about 2 months ago, I haven't put it down. Got an F2000 battle pack the other day, full of scopes and fun things. Great gun, Assault Class darling.